Conducting-rim x-ray machine.



H. BARNETT. CONDUCTING RIM X-RAY MACHINE.

APPLICATION FILED MAY I3. l lfi- 7 1,287,612. Patented Dec. 17, 1918.

3 SHEETSSHEET 1- nvemfoc fi a M 5.301770%? I H. BARNETT. CONDUCTING mm X-RAY MACHINE. APPLICATION FILED MAY13. 1916.

Patented Dec. 17, 1918.

3 SHEETS-SHEET 2- H. MRNETT. CONDUCTING RIM X-RAY MACHINE. APPLICATION FILED MAY 13. 1916.

3 SHEETS-SHEET 3.

5714, van f0 c Patented Dec. 17, 1918.

UNITED STATES PATENT OFFICE.

HARRY BARNETT, OF NEW YORK, N. Y., ASSIGNOR TO THE KNY-SCHEERER CORPO- RATION, A CORPORATION OF NEW YORK.

CONDUCTING-RIM X-RAY MACHINE.

Specification of Letters Patent.

Patented Dec. 17, 1918.

Application filed May 13, 1916. Serial No. 97,326.

T 0 all whom it may concern:

Be it known that I, HARRY BARNETr, a. citizen of the United States, and a resident of New York, county and State of New York, have invented certain new and useful Improvements in Conducting-Rim X-Ray Machines, set forth in the following specification.

This invention relates to electrical machines for therapeutic purposes, commonly called X-ray machines. The functioning purpose of the machine is to produce high potential, uni-directional as well as oscillatory electric currents for therapeutic use.

The object of the present invention is to improve and make more reliable the rectifying commutator which forms a necessary part in a machine of the class described. More specifically, the object of this invention is furthered by employing as the rotor part of the commutator an insulating disk fitted with diametrically opposed conducting rim portions which revolve synchronously with the change in sign of the alternating current source in cooperation with a set of diametrically receiving conductors and a similar intermediate set of diametrically opposed delivery conductors. The conducting rims serve as revolving bridges electrically to connect a receiving conductor first with one delivery conductor and then with the other, each time throughout the desired portion of the respective high potential secondary current waves.

A further object of the invention is to in crease the durability and life of a rotor. It has been found that a rotor in the form of a complete disk fitted with diametrically opposed conducting rims has the disadvantage, due probably to surface leakage around the supposed to be insulating rim of the disk between adjacent ends of the conducting rims. In operation such a disk too soon becomes carbonized or otherwise continuously conducting. In carrying out one object of this invention it has been found satisfactory to provide an uninterrupted airgap between the adjacent ends of the conducting rims by cutting out all of the insulating disk down to a chord at, or preferably nearer, the center than the chord connecting the adjacent ends of the conducting rims.

Further advantages of the structure set forth herein lie in the accurate balancing of corresponding parts in the several figures and in which Figure l is a front elevation with the doors removed of a machine embodying the invention; Fig. 2 is a vertical section through line II-II of Fig. 1; Fig. 3 is an enlarged detail fragmentary section through line IIIIII of Fig. 2; Fig. l is a diagram showing circuit connections; and Fig. 5-is a fragmentary section drawn to an enlarged scale through line VV of Fig. 2.

It is customary in machines of this character to employ an inverted rotary converter if it is direct current which is available as the original source, but to employ a synchronous motor if alternating current is the available source. In the drawings, the cabinet for supporting the various parts is indicated by A, while B indicates the machine, either inverted rotary converter or synchronous motor, employed to drive the rotor C shown in the form of an insulating disk 0 of mica-board in proper synchronism with the current alternations through the medium of a direct mounting upon the shaft 1 of the motor element of the machine B. An adjustable coupling 2, permitting the rotor C to be adjusted properly upon the shaft 1, is provided, while the desired permanent adjustment is usually indicated by relatively marking the coupling 2 and the shaft 1 as by a white line of paint. By this marking of shaft and coupling the parts may be shipped disassembled and may be reassembled by an unskilled person who can readily obtain the actual adjustment merely by bringing the white marks together.

The rotor C has two arc-shaped diametrically opposed conducting rims 3 and l of suitable sheet metal such as copper, suitably greater or less.

5 and 6 are insulat-ingly mounted as upon insulators T and 8, secured to a wooden frame F so that the rims 3 and 4 will revolve sufficiently close to them to permit current to leap across but out of actual contact therewith. Intermediate the receiving conductors 5 and 6 are a pair of diametrically opposed delivery conductors 9 and 10 similarly insulatingly mounted upon the insulators 11 and 12 and in similar mounted relation to the revolving conducting rims 3 and 4. The positioning of the rotor C is such that when it is desired to convey current from the conduct-or 5 to the conductor 9, one of the rims 3 or 4 bridges from 5 to 9. At this tim the other rim, for instance 4, bridges the conductor (5 to the conductor 10 so that return flow takes place from conductor 6 to conductor 10. Vhen the conducting rim 3 is revolved so that it bridges from conductor 9 to conductor 6, the sign of the current wave has changed so that it is desired that current flow from conductor 6 to conductor 9. At this time the rim 4 bridges from conductor 10 to conductor 5 so that current returns from conductor 10 to conductor 5. In this manner uni-directional flow through the delivery conductors 9 and 10 is maintained.

The conducting rims 3 and 4 each comprise a cylindrical portion .13 extending axially across the width of the disk as shown in Fig. 3, although the axial extent of this portion 3 is shown only slightly greater than the thickness or width of the disk. This axial extent is not essential and may be comprises a ring shaped portion 14 lying fiat against the face of the disk and secured directly thereto by suitable means such as the rivets 15. This construction of conduct ing rim lends itself readily to the perfect balancing of the rotor C.

n important advantage is to insure an efiicient breaking of the are or spark when an end of rim 3 such asthe end 20 leaves one of the conductors such as 5, 6, 9 and 10. This has been accomplished by cutting away the disk 0 along the radial lines 21, 22 and the chord 23. If desired to reduce windage, the exposed edges of the disk 0 along the radius cleavages 22 may be beveled or wedge shaped. Note the section in Fig. 5. g

In the drawings, the high potential transformer is indicated by T, the secondary winding of which is connected by leads 31 and 32 respectively with the receiving'conductors 5 and 6, while the surface terminals 33 and 34 are connected respectively by leads 35 and 36 to the delivery conductors 9 and 10. Satisfactory connections for the machines are shown in Fig. 4. In this diagram the mains 37 and 38 indicate a suitable source of current. In this diagram a source of alternating current is controlled by the knife-switch Each conducting rim also in its connection with the leads 40 and 41.- The stator leads 42 and 43 of the synchronous motor B may be controlled independent-ly of the double pole snap switch 44, While the circuit for the primary of transformer T may be traced as follows: main 40, wire 45, reversing switch S, wire 46, rheostat 4T, selector arm48, wire 49 or 50 or 51 or 52, primary coil 53, Wire 54, reversing switch S, wire 55, back to source lead 41. The circuit for the rotor of the synchronous motor B may be traced as follows: lead 45, wire 56, rotor back to source lead 41. The selector arm 48 is useful to determine the number of windings of the primary coil of transformer T to'be employed. The reversing switch S is serviceable in the regulating of flow of the uni-directional current commutated.

If desired, a milli-ammeter M may be connected in at the neutral point of the secondary winding 60 of transformer T.

lVhat is claimed and what is desired to be secured by United States Letters Patent is:

1. In a machine of the character described, a motor-element having alternating current windings; an insulating disk mounted to rotate synchronously with said motor-element; a pair of diametrically opposed receiving conductors; astep-up transformer having a primary coil adapted to be connected in circuit with the alternating current windings of said motor-element and having a secondary coil in circuit with said receiving conductors; a pair of diametrically opposed delivery conductors insulatingly mounted intermediate said receiving conductors; and two diametrically opposed arc-shaped conducting rims mechanically secured directly to the-circular margin of said insulating disk to serve as revolving bridges from the receiving conductors to the delivery conductors, each conducting rim having a sheetmetal cylindrical portion to conform to the periphery of said insulating disk and extenlding axially across the periphery of said dis 2. In a machine of the character described, a motor-element having alternating current windings; an insulating disk mounted to roof motor B, wire 57, lead 55, i

tate synchronously With said motor-element;

cuit with the alternating current windings of said motor-element and having a secondary coil in circuit with said receiving conductors; a pair of diametrically opposed delivery conductors insulatingly mounted intermediate said receiving conductors; and two diametrically opposed arc-shaped conducting rims mechanically secured directly to the circular margin of said insulating disk to serve as revolving bridges from the receiving conductors to the delivery conductors, each conducting rim having a sheetmetal cylindrical portion to the periphery of said insulating disk and extending axially across the'periphery of said disk and a ringshaped portion at right angles to said cylindrical portion, secured directly to the face of saiddisk.

3. In a machine of the character described, a motor-element having alternating current windings; an insulating disk mounted to rotate synchronously with said motor-element; a pair of diametrically opposed receiving conductors; a step-up transformer having a primary coil adapted to .be connected in circuit With the alternating current windings of said motor-element and having a sec ondary coil in circuit with said receiving conductors; a pair of diametrically opposed delivery conductors insulatingly, mounted intermediate said receiving conductors; and

tWo diametrically opposed arc-shaped conduct1ng rims mechanically secured directly to the circular margin of said insulating disk to serve as revolving bridges from the receiving conductors to the delivery conductors, said insulating disk providing an unbroken air gap from the end of one conducting rim straight to the end of the other by being cut away below the chord connecting the adjacent ends of said conducting rims, and each conducting rim having a sheet metal cylindrical portion to conform to the periphery of said insulating disk and extending axially across the periphery of said disk.

In witness whereof I have signed my name to this specification this 12th day of May, 1916.

HARRY BARNETT. 

